As a side note, SOM maps can be generalizable to non-vectorial data — i.e., strings —
as long as more than one ordering relation is defined [1]}, [2]}.
Therefore, our proposed statistical test could also be used to test whether two sets of sequences
— i.e., proteins or DNA — share their origin. Unfortunately, since the SOM implementation we
have based our implementation on [3]} only works with real-valued dimensions,
we have not been able to test this scenario.
